Alliance Laundry Systems T477C Gas Supply Pipe Sizing and Looping

Gas Requirements

Gas Supply Pipe Sizing and Looping


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9	10					11							12
9	10
								1		2	3	4	5		6	7	8	9
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			M
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																			TMB2126N
1	Gas Furnace (120,000 Btu/hr.)					8	25 ft. (7.6 m)
2	Gas Water Heaters (400,000 Btu/hr. each)					9	Main Regulator
3	Gas Space Heaters (70,000 Btu/hr. each)					10	Gas Meter
4	Sediment Traps, Supply Pressure Taps and					11	Pressure Regulator (if required)
	Shut-off Valves. Refer To Figure 13.					12	T30 Tumblers (73,000 Btu/hr per pocket;
5	1 in. (25.4 mm) Gas Pipe Loop						146,000 total Btu/hr for machine)
6	19 ft. (5.8 m)						T45 Tumblers (95,000 Btu/hr per pocket;
7	Minimum Pipe Size is 0.5 in. (12.7 mm)						190,000 total Btu/hr for machine)

SAMPLE CALCULATIONS:

Equivalent length = Total length of main gas supply pipe to the far end of the tumblers.

	= 25 ft. + 19 ft. (7.6 m + 5.8 m) gas supply pipe
	= 44 ft. (13.4 m) Total Gas Line
Total Btu/hr.	=	The sum of the Btu/hr. of all T30 tumblers being fed by the main gas supply pipe.
	=	9 x 73,000
	=	657,000 Btu/hr.

Using Table 7, the main supply pipe diameter should be 2 in. (51 mm).

IMPORTANT: Gas loop piping must be installed as illustrated to equalize gas pressure for all tumblers connected to single gas service. Other gas using appliances should be connected upstream from loop.

Figure 14

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